Hi Gary, welcome to the forum.
Kids have very selective taste so I will keep that in mind.
This is a simple one I use for quick energy. This is absorbed very quickly. It can even be used at halftime.
A post game blast, drink or food is also vey important to stop the catabolic effects of intense exercise. The catabolic effect is the tearing down of tissues that happens in intense exercise. By stopping the tear down recover begins much quicker.
The blast or drink must be drank within 30 minutes of the exercise to blunt the catabolic effects or it can continue for a long time after. The blast would be the same with the addition of 10 to 20 grams of protein. The protein source should be organic, lactose free whey concentrate (concentrate is best) or rice and hemp protein used together. Avoid soy proteins.
If kids were not so picky I would also add beet juice to the blast.
Wally Bishop C.N.C.